Formulated in the 1920’s, DaVinci is an original Italian Plastilina. Normal temperature ranges do no affect this unique, wax-free, sulfur based sculpting clay which has a non-sticky, smooth feel of water based clay. Available in: Soft (the softest product offered) and Firm (second softest we offer), Additional Details ------------------------------ Product description: Formulated in the 1920’s, DaVinci is an original Italian Plastilina. Normal temperature ranges do no affect this unique, wax-free, sulfur based sculpting clay which has a non-sticky, smooth feel of water based clay. Available in: Soft (the softest product offered) and Firm (second softest we offer),